Question
$$23-3\cdot4+2 = 13$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 23-3\cdot4+2 &= 13&& \text{simplify left side} \\[1 em]23-12+2 &= 13&& \\[1 em]13 &= 13&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 13 = 13 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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